Mechanical movement.



No. oms. l Patnfeu Aug. 1899.;

.l. E. HAnTwELL MECHANICAL MOVEMENT. (Application led May 4, 1899.) (NoModel);

NirEn STATES PATENT OEEIGE.

JACOB HARTWELL, OF TROY, MONTANA, ASSIGNOR OF ONE-HALF TO GEORGE WV.WATERS, OF SAME PLACE.

MECHANICAL MOVEMENT.

SPECIFICATION forming part of Letters Patent No. 630,218, dated August1, 1899.

Application filed May 4, 1899- Serial No. 715,580. (No model.)

T all whom, it may concern:

Be it known that I, JACOB E. HARTWELL, a citizen of the UnitedStates,residin g at Troy, in the county of Flathead and State ofMontana, have invented a certain new and useful Mechanical Movement, ofwhich the following is a specication, reference being had therein to theaccompanying drawings.

This invention relates to mechanical movements, the object in view beingto provide,

disengagingthemselves from the rack at the opposite side. y

The detailed objects and advantages of the invention will appear inthecourse of the ensuing description.

The invention consists in a mechanical movement embodying certain novelfeatures and details of construction hereinafter fully described,illustrated in the drawings, and incorporated in the claims.

In the accompanying drawings, Figure 1 is a side elevation of theelements which make u p the improved mechanical movement. Fig. 2 is alongitudinal section through the mechanism. Fig. 3 is an enlarged detailsection through the gear-wheel or pinion, showin g the manner ofpivoting the teeth and showing the means for maintaining the teeth intheir normal or operative positions. Fig. 4 is a cross-section throughthe mechanism, taken in line with the shaft of the gear-wheel.

Similar numerals of reference designate corresponding parts in all theviews.

Referring to the drawings, l designates a reciprocating bar or rod, and2 a rotary shaft to which rotary motion is to be communicated from therod 1 by means of mechanism interposed between the rod and shaft, ashereinafter described.

.ln carrying out the present invention a side.

gear-wheel or pinion 3 is mounted fast upon the shaft 2. The wheelcomprises a hub 4 and a pair of side plates 5, one of which is fast onthe hub and the other detachable and provided with a centrally-locatedsquare or polygonal opening 6 to fit the hub 4, one end of which issquared or polygonal to receive said plate, whereby both plates arecaused to rotate with the shaft. Pivotally mounted between the plates 5are teeth '7, the outer ends or points of which (indicated at 8) projectbeyond the peripheries of the plates 5, as shown. The points of theteeth are inclined or beveled on their rear edges, as indicated at 9,and the operative edges of the teeth, as shown at 10, are slightlyconcaved and extend substantially in radial lines outward from the axisof rotation or center of the shaft 2. The teeth 7 are of segmentalshape, each tooth being provided with one convex and one concave Theinner portions or bases ofthe teeth 7 are slightly concaved and aredescribed on the arc of a circle of which the shaft 2 is the center.Extending around within the teeth 7 is a circular spring 11, which bearsat all times against the bases of all the teeth and serves to returnsaid teeth to their normal or operative positions after they have beendeflected by the rack, hereinafter described. The teeth are allpivotally mounted intermediate their ends, as shown at 12, so that thepoints of the teeth may be pressed inward to lie wholly within the planeof the outer peripheries of the plates 5, and when they are thus pressedinward the bases of the teeth operate against the spring 11, forcingsaid spring inward. When pressure on the teeth is relieved, the springoperates to automatically rock the teeth upon their pivots until theteeth assume their normal positions and the points thereof projectoutward beyond the peripheries of the plates 5, in a manner that will bereadily understood.

The rod or bar 1 is enlarged, as shown at 95 rocatin g rack. Upon theopposite side of the frame is a similar plate 17, which, however, isprovided with a longitudinal slot 18 to embrace and slide upon the shaft2 of the gearwheel, the slot 18 being of sufficient length to allow ofthe necessary movement of the rackbar..

As the rack-bar is moved in one direction one of the racks 14 engagespositively with the teeth of the gear-wheel, and by said engagement thegear-wheeland its shaft are rotated in one direction, the teeth at theopposite side of the gear-wheel yielding and being pressed inward, so asto slip by the teeth of the rack 14 at that side of the gear-wheel. Whenthe reciprocating rod or bar is moved in the opposite direction, theopposite rack engages positively with the teeth of the gearwheel and therack on the other side of the gear-wheel slips over the teeth of thegearwheel as the latter yield inward and pass within the peripheries ofthe plates 5. It will thus be seen that the rack-bar may be reciprocatedin a rectilinear path and always in the same line without the necessityof laterally shifting the rack-bar. It is likewise unnecessary to shiftthe gear-wheel or pinion in view of the fact that the teeth yieldinward, so as to slip by the teeth on the rack. All lost motion betweenthe reciprocating and rotary elements of the device is thus obviated anda positive and reliable engagement obtained.

The movement hereinabove described may be used in a variety of placesand for a number of purposes and, in fact, wherever itis desirable toconvert-reciprocatinginto rotary motion.

I do not desire to`be limited to the exact details of constructionhereinabove set forth, as it will be apparent that the device issusceptible of changes in the form, proportion, and minor details ofvconstruction which may accordingly be resorted to without departingfrom the principle or sacrificing any of the advantages of theinvention.

Having thus described the invention, whatv is claimed as new, anddesired to be secured by Letters Patent, is-

1. A gear-wheel having pivoted teeth in combination with a single springcommon to and normally holding all of said teeth in their operativepositions but allowing the points thereof to yield inward.

2. A gear-wheel having pivoted teeth, in combination with a circularspring bearing against all of the teeth, substantially as described.

3. A gear-wheel having pivoted teeth, the bases of which lie in acircumferential plane, in combination with a circular spring bearingagainst the bases of all of the teeth, substantially as described.

4. A gear-wheel having pivoted teeth with concaved inner faces, incombination with a circular spring bearing against the concaved innerfaces of all of the teeth.

5. A, gear-wheel comprising parallel side plates, and teeth pivotallymounted between said plates and normally projecting beyond theperipheries thereof, in combination with a circular spring intermediatesaid side plates and common to and bearing against all the -teeth tohold them normally in their operative positions while allowing them toyield, substantially as and for the purpose described.

6. The combination with a gear-Wheel having yielding teeth, and acircular spring common to and operating against the inner ends of all ofsaid teeth, of a reciprocating double rack engaging the teeth onopposite sides of the center of rotation of the gear-wheel, said springpermitting the teeth to yield alternately on opposite sides of saidcenter, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

JACOB E. HAR'rwELL.

lVitnesses:

D. M. REYNOLDS, G. W. WATERS.

